One day, a music critic, Pierre, catches sight of a woman dressed in blue and immediately becomes obsessed about meeting her. He persuades his adoring mistress, Aurélie, to help him find the mysterious woman in blue. As they pursue their seemingly futile quest, Aurélie realises that Pierre’s life is beginning to fall apart...Pierre, a young musician in Paris, briefly catches sight of a beautiful woman dressed in blue and soon spends all of his time trying to track her down.